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By Nidal al-Mughrabi and Jeffrey Heller GAZA/JERUSALEM (Reuters) - Israeli Prime Minister Benjamin Netanyahu, facing international alarm over a rising civilian death toll in Gaza, said on Thursday he would not accept any ceasefire that stopped Israel completing the destruction of militants' infiltration tunnels. The Israeli military estimated on Wednesday that accomplishing that task, already into its fourth week, would take several more days. "We are determined to complete this mission, with or without a ceasefire," Netanyahu said in public remarks at the start of a meeting of his full cabinet in Tel Aviv. "I wont agree to any proposal that will not enable the Israeli military to finish this important task, for the sake of Israel's security." Leaving open the option of widening a ground campaign in the Hamas Islamist-dominated Gaza Strip, the Israeli military said it had called up an additional 16,000 reservists.